diff --git a/repochecker/file-inspector/zip.go b/repochecker/file-inspector/zip.go
index 9d4d879d..a16135e3 100644
--- a/repochecker/file-inspector/zip.go
+++ b/repochecker/file-inspector/zip.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"strings"
 
 	"srs.epita.fr/fic-server/admin/sync"
 	"srs.epita.fr/fic-server/libfic"
@@ -48,5 +49,42 @@ func checkZip(file *fic.EFile, exceptions *sync.CheckExceptions) (errs []error)
 		log.Printf("%d files found in %q", len(r.File), file.Name)
 	}
 
+	foundEtcDir := false
+	foundHomeDir := false
+	foundRootDir := false
+	foundVarDir := false
+	for _, file := range r.File {
+		if strings.HasPrefix(file.Name, "etc") {
+			foundEtcDir = true
+		}
+		if strings.HasPrefix(file.Name, "home") {
+			foundHomeDir = true
+		}
+		if strings.HasPrefix(file.Name, "root") {
+			foundRootDir = true
+		}
+		if strings.HasPrefix(file.Name, "var") {
+			foundVarDir = true
+		}
+	}
+
+	nbLinuxDirFound := 0
+	if foundEtcDir {
+		nbLinuxDirFound += 1
+	}
+	if foundHomeDir {
+		nbLinuxDirFound += 1
+	}
+	if foundRootDir {
+		nbLinuxDirFound += 1
+	}
+	if foundVarDir {
+		nbLinuxDirFound += 1
+	}
+
+	if nbLinuxDirFound > 2 && !exceptions.HasException(":not-a-linux-rootfs") {
+		errs = append(errs, fmt.Errorf("don't use a ZIP archive to store an Unix file system, prefer a tarball (:not-a-linux-rootfs)"))
+	}
+
 	return
 }